DFRobot
DFRobot SEN0711 RS485 Ammonia Nitrogen & pH Sensor
· MPN: SEN0711
Built for submerged water monitoring, this industrial-grade probe measures ammonia nitrogen concentration in water, including free ammonia (NH3) and ammonium...
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Built for submerged water monitoring, this industrial-grade probe measures ammonia nitrogen concentration in water, including free ammonia (NH3) and ammonium ions (NH4+). It combines the probe and housing into an integrated design for a simpler, more robust installation.
The sensor communicates over RS485 and supports the standard ModBus-RTU protocol. DFRobot provides tutorials for connecting it to an Arduino development board and DFRobot LoRaWAN, making it suitable for setting up a test environment and monitoring data in the field.
Automatic pH and temperature compensation help maintain reliable readings as conditions change. The unit is calibrated before leaving the factory, is ready to use on arrival, and supports two-point electrode calibration via register settings for optimisation after prolonged use.
Included in the package are the RS485 Water Quality Ammonia Nitrogen&pH Sensor x1, 5m sensor cable x1, black protective mesh x1, and cable ties x2.
Features:
- Calibration: Simple calibration function, supporting two-point electrode calibration
- Measurement range: 0~100 mg/L
- Resolution: 0.01 mg/L
- Accuracy: ±3%FS
- Design: Integrated probe housing design
- Waterproof rating: up to IP68
- Compensation: Features automatic pH and temperature compensation to ensure measurement accuracy
- Communication interface: RS485 communication interface
- Protocol: supporting ModBus-RTU protocol
Specifications:
- Power Supply Voltage: 10~30V DC
- Power Consumption: 0.3W
- Communication Interface: RS485 (Standard ModBus-RTU protocol)
- Measurement Range - Ammonia Nitrogen: 0~100 mg/L
- Measurement Range - pH: 0~14 pH
- Measurement Range - Temperature: 0°C~+60°C
- Measurement Accuracy - Ammonia Nitrogen: ±3%FS
- Measurement Accuracy - pH: ±0.15 pH
- Measurement Accuracy - Temperature: ±0.5°C
- Resolution - Ammonia Nitrogen: 0.01 mg/L
- Resolution - pH: 0.01 pH
- Resolution - Temperature: 0.1°C
- Repeatability Error: 1%
- Temperature Compensation Range: 0°C~+60°C
- Response Time: ＜30S
- Operating Temperature: 0°C~+50°C
- Waterproof Rating: IP68
- Pressure Resistance: 0.2MPa
- Cable Length: 5m
- Housing Material: Corrosion-resistant plastic
Well suited to aquaculture, wastewater treatment, environmental monitoring, hydroponics and aquaponics applications where long-term water-quality data is needed.
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs and automation devices. When a product lists Modbus support, it is generally easier to integrate with existing industrial equipment that speaks the same protocol.
- ModBus-RTU
- ModBus-RTU is a common industrial protocol for sending readings and control commands over serial links such as RS485. Knowing a device uses ModBus-RTU helps you choose software libraries, data loggers, or controllers that can request and interpret its data.
- pH
- A measure of how acidic or alkaline a liquid is, on a scale where 7 is neutral. For a water monitoring kit, pH tells you about water chemistry and whether the included probe matches the range and accuracy your project needs.
- RS485
- RS485 is a robust differential serial communication standard often used in factories, farms and buildings where cables may be long or electrically noisy, and it can link many devices on a single pair of wires. When a product lists RS485, it can communicate with industrial sensors, meters and control equipment over longer distances than typical hobby serial wiring.
- Temperature compensation
- Temperature compensation is when a sensor or instrument adjusts its readings to reduce errors caused by changes in temperature. This matters because a sensor's raw output often drifts as conditions warm or cool, so compensation keeps readings more consistent and accurate over time.
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